In the event of an EMP attack, the digital world you rely on could vanish in an instant. An electromagnetic pulse (EMP) is a massive burst of energy that can be caused by a high-altitude nuclear detonation or an extreme solar storm.

This invisible wave could fry the delicate microchips in your electronics, collapse power grids, silence cell towers and crash the internet. The result is an immediate and profound silence, severing the connections that hold modern society together.

In the wake of such an event, the ability to communicate becomes a matter of survival.

While shielded radios are the gold standard, not everyone has access to a Faraday cage. The situation may seem dire, but history offers a blueprint.

For centuries, humanity communicated effectively without a single microchip. A closer look around your home can reveal a surprising arsenal of low-tech tools ready to bridge the gap when digital systems fail. (h/t to AskAPrepper.com)

Here are 10 common household items that can be repurposed for critical communication after an EMP event.

Cans and string

Often dismissed as a childhood cliche, the classic tin-can telephone is a viable short-range communication tool. Effective for about 100 feet, it can be invaluable for communicating with someone in a garden shed, barn or watch post.

The key to clarity is to tie the string to a metal washer placed inside the base of each can. This creates a cleaner vibration.

A pre-arranged whistle signal can alert the recipient to pull the line taut for a conversation.

Chalk

For leaving large, highly visible messages, few things are as simple and effective as a piece of chalk on a hard surface like a sidewalk, wall or rock. It allows for quick marking of arrows, codes or warnings.

The effectiveness hinges on pre-arranged symbols known only to your trusted group. A star could mean "danger," a triangle a "safe zone" and a circle could instruct someone to scout the perimeter, ensuring messages aren't intercepted or misunderstood by snooping outsiders.